A car exploded while it was being searched in Somalia\'s capital Tuesday, killing at least five people, including two policemen, witness said.The witnesses told the BBC police stopped the car at the busy KM4 junction in Mogadishu.Smoke was reportedly seen rising from the city after the blast, which was followed by outbreaks of gunfire.Fighters from the Islamist militant group al-Shabaab have staged several suicide attacks in Mogadishu in recent weeks.Two foreign workers kidnapped by al-Shabaab militants in Kenya two months ago have been relocated to southern Somalia, the Shabelle News Network reported.Local residents told Shabelle the two women doctors working for MSF Spain were taken from Kenya\'s largest refugee camp. They have been moved to an unknown location in Afgoye, locals said.So far there has been no comment from al-Shabaab.